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Financial Instruments - Summary of Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments, Including Principal and Interest (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Short-term loans $ 88,754.7 $ 2,899.5 $ 63,766.8
Accrued expenses and other current liabilities 61,760.6 $ 2,017.7 65,588.4
Total non-derivative and derivative financial instruments 321,000.5   344,307.8
Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 88,810.7   63,802.0
Accounts payable (including related parties) 34,357.4   30,069.2
Payables to contractors and equipment suppliers 43,133.7   55,723.8
Accrued expenses and other current liabilities 50,241.0   24,659.7
Bonds payable 94,360.1   154,536.9
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 10,189.0   16,080.6
Non-derivative financial liabilities 321,091.9   344,872.2
Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 49,302.3   67,393.5
Inflows (49,393.7)   (67,957.9)
Derivative financial instruments (91.4)   (564.4)
Less than 1 year [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 259,327.0   242,360.9
Less than 1 year [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 88,810.7   63,802.0
Accounts payable (including related parties) 34,357.4   30,069.2
Payables to contractors and equipment suppliers 43,133.7   55,723.8
Accrued expenses and other current liabilities 50,241.0   24,659.7
Bonds payable 36,039.9   60,176.8
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 6,835.7   8,493.8
Non-derivative financial liabilities 259,418.4   242,925.3
Less than 1 year [member] | Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 49,302.3   67,393.5
Inflows (49,393.7)   (67,957.9)
Derivative financial instruments (91.4)   (564.4)
2-3 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 38,232.4   75,881.9
2-3 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 35,340.8   68,378.8
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 2,891.6   7,503.1
Non-derivative financial liabilities 38,232.4   75,881.9
4-5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 23,441.1   7,861.4
4-5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 22,979.4   7,777.7
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 461.7   83.7
Non-derivative financial liabilities $ 23,441.1   7,861.4
Later than 5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments     18,203.6
Later than 5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable     18,203.6
Non-derivative financial liabilities     $ 18,203.6